Chionopsis richthofeni (FOSSIL) (L.G. Hertlein, 1927 †)
Globivenus rigida (L.W. Dillwyn, 1817)
Lirophora riomaturensis (C.J. Maury, 1925)
Cooperella riosi M. Huber, 2010
Circe rivularis (I. von Born, 1778)
Atamarcia robusta (FOSSIL) J.D. Stilwell& Zinsmeister, 1992 †
Choristodon robustus (G.B. I Sowerby, 1834)
Chione rodulfi (FOSSIL) D. Frassinetti& Covacevich, 1993 †
Protapes roemeri M. Huber, 2010
Timoclea roemeriana (A. Issel, 1869)
Tawera rosa A.W.B. Powell, 1955
Hysteroconcha rosea (W.J. Broderip & Sowerby,1851)
Callista roseotincta (E.A. Smith, 1885)
Placamen roseotinctum (W. Bairdin G.A. Brenchley, 1873)
Pitar rostratus (R.A. Philippi, 1844)
Paphia rotundata (C. Linnaeus, 1758)
Chione rowleei (FOSSIL) A.A. Olsson, 1922 †
Kyrina rubiginosa (A. Adams & G.F. Angas,1864)
Pitar rudis (G.S. Poli, 1795)
Pitar rudis mediterraneum N. Tiberi, 1885
Eurhomalea rufa (J.B.P.A. Lamarck, 1818)
Pitar rufescens (G.P. Deshayes, 1853)
Globivenus rugatina (A. Heilprin, 1886)
Circe rugifera (J.B.P.A. Lamarck, 1818)
Petricola rugosa Sowerby, 1834
Venerupis rugosa (G.B. II Sowerby, 1854)
Kaneharaia rumoensis (FOSSIL) K. Amano, 1983 †
Lioconcha rumphii S.E.T. Van der Meij, R.G. Moolenbeek& H. Dekker, 2010
Mysia rupestris (FOSSIL) (G.B. Brocchi, 1814 †)
Venerupis ruscuriana T.A. de M. Monterosato,1884
Tivelina rustica (FOSSIL) (G.P. Deshayes, 1825 †)
Chione sacyi (FOSSIL) A.E.M. Cossmann& M.A. Peyrot, 1910 †
Tapes sacyi (FOSSIL) A.E.M. Cossmann& M.A. Peyrot, 1910 †
Calpitaria saincenyensis (FOSSIL) (Deshayes) of Krach 1981 †,
Calpitaria sainceyensis (FOSSIL) (G.P. Deshayes, 1857 †)